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Share-Based Compensation - Weighted average assumptions used in valuing options (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jun. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2019
CSFL |  |  |
Share-Based Compensation |  |  |
Options vested (in shares) | 23,923 |  |
Stock Options |  |  |
Share-Based Compensation |  |  |
Shares issued (in shares) |  | 0 | 0
Additional disclosures |  |  |
Total unrecognized compensation cost related to non vested stock option grants |  | $ 0 |
Total fair value of shares vested during the period |  | $ 1,400 |
Restricted Stock Activity and RSUs |  |  |
Assumed restricted stock shares from CSFL merger (in shares) |  | 136,831 |
Weighted-Average Grant-Date Fair Value |  |  |
Assumed restricted stock shares from CSFL mergerr (in dollars per share) |  | $ 37.85 |
Restricted Stock |  |  |
Additional disclosures |  |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  | 1 year 7 months 9 days |
Total fair value of shares vested during the period |  | $ 4,300 |
Restricted Stock Activity and RSUs |  |  |
Nonvested at the beginning of the period (in shares) |  | 69,450 |
Assumed restricted stock shares from CSFL merger (in shares) |  | 9,755 |
Granted (in shares) |  | 9,145 |
Vested (in shares) |  | (71,193) |
Forfeited (in shares) |  | (317) |
Nonvested at the end of the period (in shares) |  | 16,840 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 58.96 |
Assumed restricted stock shares from CSFL mergerr (in dollars per share) |  | 60.27 |
Granted (in dollars per share) |  | 55.96 |
Vested (in dollars per share) |  | 58.76 |
Forfeited (in dollars per share) |  | 65.86 |
Nonvested at the end of the period (in dollars per share) |  | $ 58.81 |
Additional disclosures |  |  |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted |  | $ 736 |
Restricted Stock | Maximum |  |  |
Additional disclosures |  |  |
Vesting period |  | 12 months |
Restricted Stock | Employees | Minimum |  |  |
Additional disclosures |  |  |
Vesting period |  | 4 years |
Restricted Stock | CSFL |  |  |
Restricted Stock Activity and RSUs |  |  |
Vested (in shares) | (29,303) |  |
Restricted Stock Units |  |  |
Additional disclosures |  |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  | 2 years 7 months 6 days |
Total fair value of shares vested during the period |  | $ 23,500 |
Restricted Stock Activity and RSUs |  |  |
Nonvested at the beginning of the period (in shares) |  | 324,601 |
Assumed restricted stock shares from CSFL merger (in shares) |  | 388,381 |
Granted (in shares) |  | 376,026 |
Vested (in shares) |  | (274,847) |
Forfeited (in shares) |  | (66,992) |
Nonvested at the end of the period (in shares) |  | 747,169 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) |  | $ 76.44 |
Assumed restricted stock shares from CSFL mergerr (in dollars per share) |  | 60.27 |
Granted (in dollars per share) |  | 60.74 |
Vested (in dollars per share) |  | 75.68 |
Forfeited (in dollars per share) |  | 74.44 |
Nonvested at the end of the period (in dollars per share) |  | $ 60.59 |
Additional disclosures |  |  |
Total unrecognized compensation cost related to nonvested restricted stock and RSUs granted |  | $ 33,600 |
Target RSU award level (as a percent) |  | 100.00% |
Employee Stock Purchase Plan |  |  |
Number Of Stock Issued Pursuant To Restricted Stock Units |  | 31,435 |
Restricted Stock Units | CSFL |  |  |
Restricted Stock Activity and RSUs |  |  |
Vested (in shares) | (242,018) |  |
Performance based restricted stock units |  |  |
Additional disclosures |  |  |
Performance period |  | 3 years |
Other Performance based restricted stock units |  |  |
Additional disclosures |  |  |
Performance period |  | 1 year |
Timed based restricted stock units |  |  |
Additional disclosures |  |  |
Performance period |  | 4 years |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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